Bit extension.



r. n. cARL som v BIT EXTENSION. APPLICATION FILED 1030.7, 1907.

Patented Sept 22,1908.

2 21 Inventor: Fred rack ECarlson.

unnollu n yin: 0O. Ila-mum. c

ST-Ar as PATEXT ornron.

' FREDERECK E. CARLSON, OF XElY BRITA Ih, CONNECTICUT, ASSIGXOR TO THE STANLEY f RULE & LEVEL COMPANY; OF NEW BRITAIN, CONNECTICUT, Av CORPORATION" OF (ONNEC-TIQUT.

Specification of Letters Patent.

BIT Ex'rENsroN.

Patented Sept. 22, 1908.

To all whom it may concern;

Be 1t known that I, .FnEnEREc E. CARL- SON, a citizen of the United States, res'i'ding in New Britain, in the; county of Hartford and State of Connecticut, have Invented eer-' .tain new 'aml useful Improvements'in Bit Extensions, of which t specification.

Thisimprovement relates to extensions for bits or augers of boring tools, such as used by carpenters and others for boring i'e following is a holes of considerable de )th or length with bits of ordinary length, )y the use of ordinary bit stocks or other handle devices by which the bit is rotated; the extension being adapted to follow the bit into thehole.

I whereby holes of considerably greater length ment. Fig. 5 is a section onthe line 5 than that. ofordinary bits can be bored.

- One of theob ects of my present unprovement is to furnish a strong and reliable implement of this class in which the bit shall be driven after the manner of applying a wrench to the shank thereof, and in \\'ll1(l1 aquick' acting chuck device can be caused to posttively and strongly grip the bit, and serve to eilictently remove the )it as well as to effect the positive driving thereof.

A further object of the invention is to rovide means in such a device whereby )its having difl erent $1205 or forms of socket ends can beclam jed in the device without special In thedrax'rings aceompanyiin and forming a part of this specification, s "owing one embot intent of my present invention, Figure 1 is a side elevation, partly in'section show-- ing the device in use, the shank of' the hit belngbroken off just beyond the jaws. Fig. 2 is a side elevation, artly in section, of Fig. 1,,taken at right ang es to the view shown in Fig. 1 Fig. is a view similar to Fig. '2 with- .the' parts in open position and the b t re-' moved. Fi 4 is a view similar to Fig. 1 showing the aws swung laterally f or adjust- 5 of Fig. 2 showing the jaws when first opened. Fig. 6 is a similar view butshowing the sleeve as swung laterally on the shank to bring the locking lugs into engagementwith t-he'jaw members respectively. Fig. 7 is a similar view with the jaws closed. Fig, 8 is a seer tion on line 8-8 of- Fig. 3. Fig. 9 is a. side elevation of one of the jaw members. Fig;

.10 is an elevation showing the other jaw member. Fig. 11 shows the two jaw members in elevation and slightly removed; and Fig. 12 shows a modified jaw in inside elevation.

The invention comprises essentially a stem or shank member having a socket at one end of' polygonal section and preferably made tapering for engagement. with the COI'I'B. sponding taperingv end'of a. bit, the shank -7o acting in the nature of a socket wrench; and a. pair of jawmembers slidable on. the socket and having inturned end portions for e aging the shank of the bit beyondits hea or socket engaging portion, the jaws being slidable on the shank and provided with means for securing them to grasp the shank i of the bit and retain it in the socket, by preventing endwisc movement of the bit out of the socketportion of the shank or stem. 0

The implement is primarily designed as an extension bit, adapted, for engaging the shank endof a boring bit at its jaw end, while its other end portion is provided with a tapered square end portion similar to that of 35 the head or stock engaging portion of the bit, whereby such endcan be secured in the ordinary brace or hit stock. And the extension is made of an external diameter less than that of the boring bit whereby it can follow the bit into the hole. But the invention is also applicable as a chuck member for other purposes; for instance it could form the bit,- engaging end of an ordinary bit stock, or of a socket wrench.'whereby to drive the bit into the hole, and remove the same; and

can be used for other tools than boring bits, such as screw-dr1ver,filcs or reamers. v

In the present embodiment, the mven't-ion is shown as having a stem or shank 12 pro yidedwith a tapercdsqnare socket 13 at one end,- wlnle the other end is provided witlta socket-engag ngtapered head 14, similar to the conventional or standard socket-engaging head of the bits generally in use. p A plurality of jaws are provided at the socket end, preferably two jaws 15 and 16, that are slid able on the stem 12, and normally connected together at their rear ends, whereby-the shank engaging ends 17 and 18 can rela' 2 v. V V I Q 7 899,208 g i. Q.

tively swing to and fro, to engage the shank 19 beyond'theread 20 of a bit, a portion only of which is shown. The ends 17 and 1S are'intnrned, to engage the shank 19 when the jaws are in the closed position, as indi' catedin Figs. 1 and 2,

The socket I" has the walls preferably made curved of convex rela ti've -to the axis of thesocket or stein,- as shown in Fig. 1, for.

the purpose of accommodating heads having different angles of taper, and also for the nrpose of accommodating bits wherein the liead is distorted or bent to one sideof the axis of the bit or shank.

One form of movable jaw connection is shown inthe drawings, in which the jaw member 16 isprovided with'apair of heads or tongues 21 fitting into socketportions 22 in the jaw 15, as indicated in Figs. 2, 3, and 11. Such hinge portions can be readilyformed by stamping, the heads being inserted-1n the socket portion by a lateral movement before the jaws are inserted on the stem. By this" means the jaw members have a slight swing on each other to open and'close. They are also given aplay on the stem to bodilyswing' laterally as a whole as indicated in Fig. 4.

The portion 12 of the stem where engaged by the. hinged portion of the jaws may inpractic-e be only slightly if any less in diameter than the main portion of the stem; since this reduction is chiefly for the purpose of per.-

niitting some freedom of lateralmovementof the jaws, as illustrated .for instance in Figs. 3, 4 and 6. i I

Aiter the bit has its head inserted in the socket- 13, with the jaws in the open position as shown in Fig. 3, the jaws are then moved inward to engage the stem 19 adjacent the head: 20 of the bit where the enlargement be- Means are provided for locking the jawsin this position, both to prevent their opening, and to prevent their longitudinal movement on the stem, whereby the bit is securely locked in the socket )ortion of the stem. In the construction illustrated, the jaw member 15 is provided with a slot 23, at one side of which are ratchet teeth 24, and the other jaw 16 is provided with a similar slot 25 having at one side ratchet teeth '26. These teeth are arranged in the jaws so that they are not on dlametricall opposite sides of the slots, but are on atl'accnt sides as shown in Figs. 9 and 10. o engage these teeth in the jaws, a pair of lugs 27'- and' 28 are arranged on the stem 12, diametrically opposite and projecting into the slots 23 and 25 esn'ot provided endwise'on the stem, for receiving the bit. Then when the bit has been inserted and the the bit head, as indicated in Figs; 1 and 2, the jaws will bring the lugs into engagement with the teeth in the slot portions, which, from the direction of slant of theratjchet teeth will prevent the 'aws being moved outwardly to release the it.

If desired, the toothed portions 24 and 26 of the respective jaws can be relatively arranged so t iat they are not opposite, but staggered relative toa transverse lane, that will permitof a somewhat finer at .justment; as will be seen by comparing Figs. 9 and 12. But if desired,'the teeth can be omitted in one of the jaw members, and the other tooth portion of the jaw member alone serve to lock the jaws in adjusted positions. To secure the jaws in this-position, a sleeve 30 is providedthat is slidable over the rear end of the jaws, and over the shank, and is preferably forced downward onto the intermediate spring 31 engaging the int urned end 32 of the sleeve byone end, while its other end enga es a stop collar 33 secured on the stem. This sleeve will serve to press the jaws together by reason of their tapered or conical portion,.and prevent. their opening to release the bit. To engage the bit in the device, the sleeve 30 is slid back com 'n'e'ssing the coil spring, the jaws are opened, and the head of the bitinserted-in the socket 13 of the stem. Then the jaws as a whol'eare'swung on an asis'substantially at right angles with the axis of their hinged joint as indicated in Fig. 4. This will swing the teeth in the slots away from the lugs 27 and 2S, and the jaws are moved inward to bring their inturned ends dieated in Fig. 2. flhercnpon the jaws are returned to their )osition of alinement with the stem and the sleeve 30 is permitted to be forced down onto the taper-e portion of the jaws bv the coil s )ring 31, The movement into alinement o the jaws will bring the ratchet teeth into -engagement with the lugs, and this will prevent endwise movement of the jaws outward that would release the bit in the socket.

A slight modification is shown in which guide pins 34 are placed on the stem on each side between the adjacent edges of the jaws. 'In this modificatitm, the jaw 36 is'substituted for the jaw 16 inwhich the ratchet teeth. 38 areplace'd on the opposite side of the slot, as further indicated in Figs. 7 and 8. In this formthe sleeve will not of. itself serve lugs might disengage withftl e teeth of the jaw members. The guide pins 3-1 and 35 are at 1 l Q s ugb' fitlw ve9 the. ja members in their closed position, and ther with teeth, the jaws are free to be moved tapering portion 29 of the jaws by a coil in engagement with the head of the bit, as injaws are returned to axial position'to engage i to prevent-turhing of the jaws whereby the 60 W130 movement of the jaws when closed on by preventturning of the jaws. on the stem, am also serve to guide the aws in their longitudinal movement. These pins are located pins on cam) sleeve having been drawn hackward preon the stem relatively to the teeth engaging the lugs 27 and 28, whereby when the aws are brought together engaging the pins the said lngswlll be forced to enter between the viously and retained in such position permit ting the aws to open, the aw member is now turned to shift the lugs away from the teeth,

which will bring the pins to engage oppositeportions of the respective jaws as indicated in Fig. 7. Consequently, the jaw meinber is now free from the lugs, and can be moved outward to open wider for the purpose of receiving the' bit. After the bit has been inserted, the jaws are drawn inward toa position for engagement with the shank adjacent the. head of the bit, and then the jaws are brought together, and the sleeve 30 permitted to be forced down ontg them at their tap ered portion b3 tlie spiing 3l. The act of closing the jaws, will bring them both into engagement with the guide pins 34 and 35 and consequentlvthe jaws will be turned so that the toothed portion will be forced into engagement with their respective lugs 27 and 25, thereby locking the jaws in such position.

Having thus described my invention, 1 claim: i

1'. Ina device of the character described,

the combination of a stem having a bit en gaging socket in one end, a pair of jaws movably connected together at one end and slid- ,able on the stem exterior-1y at the socket end portion, the jaws having their other end portions inturned and arranged to move to and fro to' engage the shank of a bit-inserted inthe stem socket, a member slidable on the stem to engage the jaws and hold them closed upon the bit shank, and means fol-prevent- "mg endwise movementofthe-jaws when closed on the bit.

2. In a device of the. character described,

the combination of, a stem having a bitengaging socket in one end, a pair of jaws movablv connected together at one end and'shd-' able on the stem at the socket endportion, the

jaws having .their other end portions inturned and arranged to move to and fro to engage the shank of a bit inserted in the stem socket, a member slidable' on the stem teen gage the jaws and hold them closed upon the blt shank, locking means for preventing end- V the bit in different longitudinal positions.

connected tog ethe r at one end nd 'slid- 1 able on the stem at the socket end portion, the

aws having, their other end portions 1n- .turned and arranged to move to and fro to engage the shank of a bit insertedin the stem socket, a: member slidable on the stem to engage the jaws and hold them closed upon the lgit shank, a resilient member for retainin said latter member engaging the. jaws, and

"means for preventing endwise movement of the aws when engaged by said retaining member.

4. In a device of the character described,

the combination of a stem having a bit engaging socket in one end portion, a pair of jaws movably connected together at one'end and slidable on the stem, the other ends of the aws bemg-inturned and movable to and fro to engage the shank of a bit inserted in the stem socket, the jaws having an external tapering portion converging toward the hinged end, a sleeve slidable on the jaw member to engage the conical portion and retain the aws in engagement with the bit shank and means for preventing end'wise movement of the aws when closed on the bit.

5. In a device of the character described, the combination of a stem having a bit-engaging socket in one end portion, a pair of jaws movably connected together at one end and slidable on the stem, the other ends of the jaws belng mturned and movabletoand fro to engage the shank of a bit inserted in the stem socket, the jaws having an external tapering portion converging toward the hingedend, a sleeve shdable onthe aws to engage the conical portion and retain the jaws in engagement with the bit shank, a collspring' on the stem engaging said sleeve to force it intoengage mentwit-h the conical portion of the jaws and means for preventing endwise movement of the jaws when closed on the bit;

6. Ina device of the character described,

ing socket in one end, a pair, of jaws movabl y connected together at one end and slidable on the stem, the aws having their other ends inturned and loc'atcdto engage the shank of av bit inserted in the stem socket, a member arranged to hold the jaws in closed position, one of the jaw members having a longitudinal slot provided with teeth at one side, and a lug on the stem projecting into said slot ar-,

ranged to engage the. teeth to lock the jaws from end'wis'e movement.

7 In a device of the character described, the combination of a stem havin g a bit-enga ing socket in one end, a pair of 'aws movab connected together at one end on the stem with their other ends inturned to engage the shank of a bit inserted in the stem socket, each of the jaws having a longitudinal slot having teeth at one side, and a pair of lugs on the stem pro ecting into the respective sockets and arranged to engage the saw the combination of a stem havinga bit-enga and slidab e i i v a move to and fro to enga ethe shank ot a bit the stem.

vhinged to each other by integral interlocking teeth upon lateral movement of the jaw-"s on j and on the stem to have a swinging movej V j ment to open and'close, and means adated 'S-. Ina device of the character dscilbeti to engage the aw members and hold t mm the combination of a stem havmga bltengagclosed. mg socket lnone end, the socket harn'tg its 1 10. In a (iGYlCG of the character descrlbed, walls formed convex toward the axis of the the COIIibDItIi-IOD of astemhavmgah'it engagstem, a pair of ews movably connected to- '1 V V n gether at one end and shdab'le on the'stem at shdable on the stem exteriorly and conslstthe socket endpt'n-tions, the aws having their mg of two parts hmged to'each other to reother end portions mt'urned and arranged to tain the aws m engagement with each other 1 i l I 1 E mg socket at one end, a tubular jaw memb :r

and on the stem for Swinging movement to open and close, the outer ends of said jaws constructed to engage the shank of the bit inserted in the stem socket, means slidable on inserted in the stem socket, a member slidable on the stem to engage the jawsand hold them closed upon the hit shank, and means for prerenting endwise movement of the jaws when closed on the bit, closed on the bit shank, and means for re- 9. In a device ofthe character described, a t venting endwise movement of the jaws W en stem having a bit engaging socket at one end, closed on thebit. and a tubular aw member shdable on the FREDEREQK E CARLSON.

stem exterior-1y and consisting of two parts a VVIUIGSSGSZ W. J. WoRAM,

tongueand socket portions, thereby retain- E. G. IIOFFMAN.

ing the jaws in engagement with each-other the stem to engage the jaws and hold them" 

